Water cooling system and method for high-pressure power amplifier of high-thrust vibrating tableTechnical Field
The invention relates to the technical field of vibration table cooling, in particular to a high-pressure power amplifier water cooling system and method for a high-thrust vibration table.
Background
The electric vibration table is mainly used for simulating the actual vibration environment of the test piece, so as to detect the actual working performance of the test piece. Because of rapid development of science and technology, the thrust requirement on the vibrating table is gradually increased at present, in order to meet the requirement of a high-thrust vibrating table, the requirement on a high-voltage power amplifier of the vibrating table is also higher and higher, and the temperature of the high-voltage power amplifier is increased in the working process so as to influence the performance of normal working, therefore, the heat dissipation of the high-voltage power amplifier becomes particularly important. In the prior art, the following disadvantages and shortcomings mainly exist when the high-voltage power amplifier is cooled:
(1) At present, an air cooling heat dissipation device is mainly adopted for cooling the high-voltage power amplifier, and less air cooling heat dissipation efficiency is adopted for the water cooling heat dissipation device, so that the heat dissipation effect for cooling the high-voltage power amplifier is not ideal;
(2) In the existing water cooling device for the high-voltage power amplifier, water cooling pipelines in the water cooling plate are generally in a uniform distribution mode, the heating characteristic of the high-voltage power amplifier is not considered, so that the cooling water is unevenly distributed, and the heat dissipation effect on the high-voltage power amplifier is poor;
(3) In the existing water-cooling heat dissipation device of the high-voltage power amplifier, the problem that the heat dissipation of the high-voltage power amplifier is not ideal due to the fact that the flow of cooling water of each water-cooling heat dissipation plate is uneven due to the fact that the lengths of cooling water pipelines are different is not considered;
(4) In the existing water-cooling heat dissipation device of the high-voltage power amplifier, cooling water among all power cabinets is provided by pipelines with the same drift diameter, and in practice, the difference of heating values of the power amplifiers in all power cabinets inevitably exists due to the difference of working performances, so that the running temperatures of all power cabinets are different, and the cooling performance of all power cabinets is different due to the adoption of the water supply cooling mode of the same pipeline, so that the temperature consistency is poor.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention provides a high-pressure power amplifier water cooling system and a high-pressure power amplifier water cooling method for a high-thrust vibrating table.
The technical scheme adopted by the invention is as follows: in a first aspect, the present invention provides a high-thrust vibrating table high-voltage power amplifier water cooling system, comprising: at least one water-cooling radiating plate is arranged in each power cabinet, and power amplifiers are arranged on two sides of the water-cooling radiating plate; the water cooling heat dissipation plate is provided with a water inlet and at least one water outlet, and pipelines between the water inlet and the water outlet are continuously bent and distributed in a manner that the middle part is dense, the upper part and the lower part are sparse; a proportional throttle valve arranged in each power cabinet for controlling the inflow of cooling water; the temperature sensor is arranged at the cooling water inlet and the cooling water outlet of each power cabinet and is used for detecting the temperature of the cooling water inlet and the temperature of the cooling water outlet of each power cabinet; and the control unit is used for collecting cooling water temperature information of the temperature sensor and control voltage information of the proportional throttle valve so as to dynamically adjust the cooling water flow of each power cabinet.
As a further improvement of the invention, when the number of the water-cooling heat dissipation plates in each power cabinet is more than two, a flow dividing and collecting valve is arranged in the power cabinet, so that the flow of cooling water in each water-cooling heat dissipation plate is the same.
As a further improvement of the invention, the water-cooling radiating plate is of a cuboid structure, a cooling water inlet is arranged in the middle of one end, and water outlets are respectively arranged at the upper end and the lower end of the water-cooling radiating plate.
As a further improvement of the invention, each power cabinet is provided with one proportional throttle valve, one end of the proportional throttle valve is connected with a cooling water main inlet, the other end of the proportional throttle valve is connected with the flow dividing and collecting valve, and the flow dividing and collecting valve is connected with the water cooling plate inlet.
As a further improvement of the invention, four water-cooling radiating plates are arranged in each power cabinet, and two power amplifiers are respectively arranged on two sides of each water-cooling radiating plate.
As a further improvement of the invention, three flow distributing and collecting valves are arranged in each power cabinet, the three flow distributing and collecting valves are combined for use, and the cooling water is distributed in four paths with equal quantity, so that the flow of the cooling water in the four water cooling radiating plates is the same.
In a second aspect, the invention also provides a water cooling working method of the high-pressure power amplifier of the high-thrust vibrating table, which comprises the following steps:
Step S1, setting an initial value of a control voltage of a proportional throttle valve in each power cabinet, and recording the maximum control voltage of the proportional throttle valve asSetting the control voltage initial value of the proportional throttle valve in each power cabinet asWherein, the method comprises the steps of, wherein,The control voltage proportion coefficient expressed as the proportion throttle valve has a value range of 0.6-0.7;
S2, when the water cooling system starts to work, collecting the outlet temperature of the cooling water and the control voltage of the proportional throttle valve, and calculating the average value, the temperature difference, the normalized temperature difference value and the relative error of the outlet temperature of the cooling water;
Step S3, when the water cooling system starts to work, every otherThe control voltage of the proportional throttle valve in each power cabinet is corrected once to regulate the flow of cooling water.
As a further improvement of the present invention, in step S2, the method for calculating the average value, the temperature difference, the normalized temperature difference value and the relative error of the cooling water outlet temperature specifically includes:
Step S21, memory sharingWhen the water cooling system starts to work, every other power cabinetCollecting the outlet temperature of the cooling water in each power cabinet once in time to form a cooling water outlet temperature sequenceWherein, the method comprises the steps of, wherein,The time interval is represented by a time interval,Represent the firstPower cabinet NoThe outlet temperature of the cooling water is collected for the second time,The value of (2) is，The value of (2) isAnd is also provided withIs an integer; The value range of (2) is 5 minutes to 10 minutes;
step S22, when the water cooling system starts to work, every otherThe control voltage of the proportional throttle valve in each power cabinet is collected once in time and recorded as the first timePower cabinet NoThe control voltage of the proportion throttle valve of the secondary collection is；
Step S23, calculate the firstAverage value of sub-collected cooling water outlet temperatureThe specific calculation steps are as follows: according to the cooling water outlet temperature sequenceRemovingMaximum value and minimum value in (2) to find the remainderAverage value of outlet temperatures of cooling water；
Step S24, defining the cooling water outlet temperature difference sequence asWherein, the method comprises the steps of, wherein,Represent the firstIn a power cabinetSub-harvest cooling water outlet temperature and thThe absolute value of the average difference of the sub-collected cooling water outlet temperatures,The calculation formula of (2) is；
Step S25, defining the normalized cooling water outlet temperature difference sequence asWherein, the method comprises the steps of, wherein,Representation ofThe value after the normalization is carried out,The calculation formula of (2) isWherein, the method comprises the steps of, wherein,Represents the lower limit of the normalized interval，Represents the upper limit of the normalized interval and，AndRespectively representMaximum and minimum values of (a);
step S26, defining a cooling water outlet temperature relative error sequenceWherein, the method comprises the steps of, wherein,Represent the firstPower cabinet NoThe relative error of the temperature of the cooling water outlet after the secondary collection,The calculation formula of (2) is。
As a further improvement of the present invention, in step S3, the step of every otherThe control voltage of the proportional throttle valve in each power cabinet is corrected once to adjust the flow of cooling water, and the specific method comprises the following steps: in the first placeIn a power cabinetThe control voltage of the secondary comparative throttle valve is corrected as an example, and the corrected control voltage of the proportional throttle valve is recorded asAccording toThe control voltage correction modes of the proportional throttle valve are divided into four types, and the specific classification is as follows:
first kind, ifWhereinIs the lower limit of the cooling water outlet temperature relative to the error threshold valueThe control voltage of the throttle valve is not corrected;
The second category: if it isOr (b)WhereinIs the relative error intermediate threshold value of the cooling water outlet temperature andThe control voltage of the throttle valve of the comparative example is corrected whenIn this case, the control voltage of the corrected proportional throttle valve isWherein, the method comprises the steps of, wherein,Is a proportionality coefficient; when (when)In this case, the control voltage of the corrected proportional throttle valve is；
Third category, ifOr (b)WhereinIs the upper limit of the cooling water outlet temperature relative to the error threshold valueThe control voltage of the throttle valve of the comparative example is corrected whenIn this case, the control voltage of the corrected proportional throttle valve is; When (when)In this case, the control voltage of the corrected proportional throttle valve is；
Fourth category, ifThe control voltage of the throttle valve of the comparative example is corrected whenIn this case, the control voltage of the corrected proportional throttle valve isWhen (when)In this case, the control voltage of the corrected proportional throttle valve is。
Compared with the prior art, the invention has the beneficial effects that:
(1) The invention designs the water-cooling heat dissipation plate with dense waterways and sparse two sides aiming at the heating characteristics of different parts of the power amplifier, and can effectively cool the power amplifier;
(2) The proportional throttle valve is arranged in each power cabinet, and the flow of each water-cooling radiating plate is synchronously controlled by adopting the flow dividing and collecting valve, so that the flow uniformity in each water-cooling radiating plate in each power cabinet can be effectively ensured, and the cooling effect of each water-cooling radiating plate is ensured;
(3) The control voltage of the comparative throttle valve adopts different correction amounts according to different relative errors of cooling water temperatures, so that the cooling effect of the power amplifier can be effectively improved. When the relative error of the cooling water temperature is small, the control voltage of the comparative example throttle valve is not corrected, and when the relative error of the cooling water temperature is medium, the control voltage of the comparative example throttle valve is increased by the linear correction of the cooling water outlet temperature difference; when the relative error of the cooling water temperature is large, the control voltage of the comparative throttle valve increases the square correction quantity of the cooling water outlet temperature difference; when the relative error of the cooling water temperature is particularly large, the comparative throttle control voltage increases the third-order correction amount of the cooling water outlet temperature difference.
Drawings
The invention will be described in further detail with reference to the accompanying drawings and specific examples.
FIG. 1 is a block diagram of a high-pressure power amplifier water cooling system of a high-thrust vibrating table of the invention;
FIG. 2 is a block diagram of a water-cooled heat sink according to the present invention;
FIG. 3 is a three-dimensional structure of a water-cooled heat sink according to the present invention;
FIG. 4 is a control voltage correction strategy logic diagram of the proportional throttle valve of the present invention;
In the figure, a 1-water cooling radiating plate, a 2-power amplifier, a 3-proportional throttle valve, a 4-split and flow-collecting valve, a 5-temperature sensor, a 6-control unit, a 7-cooling water total inlet, an 8-cooling water inlet, a 9-cooling water outlet, a 10-cooling water total outlet, an 11-power cabinet and a 12-plug.
Detailed Description
Referring to fig. 1, a water cooling system of a high-pressure power amplifier of a high-thrust vibrating table comprises water cooling heat dissipation plates 1, power cabinets 11, proportional throttle valves 3, flow dividing and collecting valves 4, temperature sensors 5 and a control unit 6, wherein the system is provided with three power cabinets 11 and a control unit 6, each power cabinet 11 is internally provided with one proportional throttle valve 3, three flow dividing and collecting valves 4 and four water cooling heat dissipation plates 1, a temperature sensor 5 is arranged on a pipeline near a cooling water main water inlet 7, and a temperature sensor 5 is arranged at a cooling water outlet of each water cooling heat radiator 1. The cooling water flow path is: the cooling water is split into three power cabinets 11 from a cooling water main water inlet, and in each power cabinet 11, the cooling water enters the proportional throttle valve 3, then enters the split flow valve 4, is split into four paths by the split flow valve and enters the inside of each water-cooling heat dissipation plate 1, and after the heat of the power amplifier 2 is absorbed, the cooling water enters the cooling water main water outlet 10 from the cooling water outlet, and then enters a pipeline. Regarding the control part, the proportional throttle valves 3 in each power cabinet 10 are electrically connected to the control unit 6, and all the temperature sensors 5 are electrically connected to the control unit 6.
Referring to fig. 2 and 3, the water cooling plate 1 of the present invention has the following specific structure: the water cooling heat dissipation plate 1 is of a cuboid structure, is vertically arranged in the power cabinet 10, and two power amplifiers 2 are respectively arranged on two side surfaces of the water cooling heat dissipation plate 1. The middle part of one end of the water cooling plate 1 is provided with a cooling water inlet 8, the far ends of the upper side and the lower side are respectively provided with a cooling water outlet 9, cooling water enters the middle pipeline from the cooling water inlet 8 and then forms two paths, one path is upward, the other path is downward, the two pipelines continuously bend and advance, finally, the cooling water reaches the positions of the upper cooling water outlet 9 and the lower cooling water outlet 9, and other outlets are sealed by plugs 12. The two pipelines are bent at the middle part of the plate more densely, and gradually sparsely in the advancing process towards the cooling water outlet. The density distribution of the pipelines mainly considers the arrangement of the electric elements in the power amplifier, so that the dense areas of the electric element arrangement correspond to the dense areas of the pipelines more pertinently, and the heat dissipation effect on the power amplifier is better.
The control unit 6 is electrically connected with the proportional throttle valve 3, can collect the proportional regulating voltage thereof, is electrically connected with the temperature sensor, can collect the water temperature at the position of the cooling water main water inlet 7, and measures the water temperature after the power amplifier 2 absorbs heat by all the water-cooling heat dissipation plates 1 in each power cabinet 11.
In order to achieve accurate heat dissipation of the power amplifier, the control unit 6 needs to adjust the proportional throttle valve 3 in real time in combination with the temperature information of the temperature sensor 5. The water cooling working method of the high-pressure power amplifier of the high-thrust vibrating table provided by the invention can specifically realize the precise control, and referring to fig. 4, the working method specifically comprises the following steps:
step S1, setting an initial value of a proportional throttle valve control voltage in each power cabinet, wherein the specific steps are as follows: the maximum control voltage of the proportional throttle valve is recorded asSetting the control voltage initial value of the proportional throttle valve in each power cabinet asWherein: The control voltage scaling factor expressed as a scaling throttle valve,The value range of (2) is 0.6-0.7.
S2, when the water cooling system starts to work, collecting the outlet temperature of the cooling water and the control voltage of the proportional throttle valve, and calculating the average value, the temperature difference, the normalized temperature difference value and the relative error of the outlet temperature of the cooling water, wherein the specific steps are as follows:
(1) Common memoryWhen the water cooling system starts to work, every other power cabinetCollecting the outlet temperature of the cooling water in each power cabinet once in time to form a cooling water outlet temperature sequenceWherein: The time interval is represented by a time interval,The value of (2) is in the range of 5 minutes to 10 minutes,Represent the firstPower cabinet NoThe outlet temperature of the cooling water is collected for the second time,The value of (2) is，The value of (2) isAnd is also provided withIs an integer;
(2) When the water cooling system starts to work, every otherThe control voltage of the proportional throttle valve in each power cabinet is collected once in time and recorded as the first timePower cabinet NoThe control voltage of the proportion throttle valve of the secondary collection is；
(3) Calculate the firstAverage value of sub-collected cooling water outlet temperatureThe specific calculation steps are as follows: according to the cooling water outlet temperature sequenceRemovingMaximum value and minimum value in (2) to find the remainderAverage value of outlet temperatures of cooling water；
(4) Defining the sequence of the temperature difference of the cooling water outlet asWherein: Represent the firstIn a power cabinetSub-harvest cooling water outlet temperature and thThe absolute value of the average difference of the sub-collected cooling water outlet temperatures,The calculation formula of (2) is。
(5) Defining normalized cooling water outlet temperature difference sequence asWherein: Representation ofThe value after the normalization is carried out,The calculation formula of (2) isWherein: Represents the lower limit of the normalized interval，Represents the upper limit of the normalized interval and，The value range of (2) is 1-1.2,The range of the value of (2) is 1.4-1.6,AndRespectively representAnd the maximum and minimum of (a) are defined.
(6) Defining a relative error sequence of the outlet temperature of cooling waterWherein: Represent the firstPower cabinet NoThe relative error of the temperature of the cooling water outlet after the secondary collection,The calculation formula of (2) is。
Step S3, when the water cooling system starts to work, every otherThe control voltage of the proportional throttle valve in each power cabinet is corrected once to adjust the flow of cooling water, so as toIn a power cabinetThe control voltage of the throttle valve of the secondary comparative example is corrected by the following specific steps: the control voltage of the corrected proportional throttle valve is recorded asAccording toThe control voltage correction modes of the proportional throttle valve are divided into four types, and the specific classification is as follows:
First category: if it isWherein: Is the lower limit of the cooling water outlet temperature relative to the error threshold value，The control voltage of the throttle valve of the comparative example is not corrected when the value range is 0.1-0.15.
The second category: if it isOr (b)Wherein: Is the relative error intermediate threshold value of the cooling water outlet temperature and，The value range of (2) is 0.2-0.25, the control voltage of the throttle valve of the comparative example is required to be corrected whenIn this case, the control voltage of the corrected proportional throttle valve isWherein: Is a coefficient of proportionality and is used for the control of the power supply,The value of (2) is in the range of 0.8-0.85 whenIn this case, the control voltage of the corrected proportional throttle valve is。
Third category: if it isOr (b)Wherein: is the upper limit of the cooling water outlet temperature relative to the error threshold value，The value range of (2) is 0.3-0.35, the control voltage of the throttle valve of the comparative example is required to be corrected whenIn this case, the control voltage of the corrected proportional throttle valve isWhen (when)In this case, the control voltage of the corrected proportional throttle valve is。
Fourth category: if it isThe control voltage of the throttle valve of the comparative example is corrected whenIn this case, the control voltage of the corrected proportional throttle valve isWhen (when)In this case, the control voltage of the corrected proportional throttle valve is。
According to the cooling working method, the cooling water outlet temperature of each power cabinet is collected in real time, the control voltage of the proportional throttle valve of each power cabinet is collected in real time, and the heat dissipation state of the power amplifier in each power cabinet is dynamically regulated in real time, so that each power cabinet can be in the best cooling effect to the greatest extent.
The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited thereto, and various changes can be made within the knowledge of those skilled in the art without departing from the spirit of the present invention, and the present invention is defined in the claims.